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Corporate Reorganization of the Telecom Group and Its controlling companies - Amortization (Details) |  |  |  | 1 Months Ended | 12 Months Ended |
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Jun. 22, 2017 USD ($) shares | Jun. 22, 2017 ARS ($) shares | May 31, 2017 | May 23, 2017 USD ($) director shares | May 23, 2017 ARS ($) director shares | Mar. 31, 2017 USD ($) tranche item | Dec. 31, 2017 ARS ($) shares | Mar. 31, 2017 ARS ($) shares
Amortization of Sofora shares |  |  |  |  |  |  |  |
Shares issued | shares |  |  |  |  |  |  | 984,380,978 |
Issued capital |  |  |  |  |  |  | $ 984,380,978 |
Sofora | Argentina Inversiones S.A. |  |  |  |  |  |  |  |
Amortization of Sofora shares |  |  |  |  |  |  |  |
Number of tranches | tranche |  |  |  |  |  | 2 |  |
Shares issued | shares |  |  |  |  |  |  |  | 140,704,640
Issued capital |  |  |  |  |  |  |  | $ 140,704,640
Amortization of shares |  |  |  |  |  | $ 8,683,596 |  |
Shares amortized | shares | 65,955,300 | 65,955,300 |  | 74,749,340 | 74,749,340 |  |  |
Percentage of capital stock owned and voting rights | 15.00% | 15.00% |  | 17.00% | 17.00% |  |  |
Amount paid to acquire shares |  | $ 65,955,300 |  |  | $ 74,749,340 |  |  |
Unpaid dividends percentage |  |  | 2.00% |  |  |  |  |
Dividend rights certificate, redemption period |  |  |  |  |  | 36 months |  |
Paid percentage of maximum dividends payable, redemption threshold |  |  |  |  |  | 60.00% |  |
Sofora | Argentina Inversiones S.A. | Class A Bono de Goce |  |  |  |  |  |  |  |
Amortization of Sofora shares |  |  |  |  |  |  |  |
Dividend rights | $ 216,280,387 |  |  | $ 245,036,017 |  |  |  |
Sofora | Argentina Inversiones S.A. | Minimum | Class A Bono de Goce |  |  |  |  |  |  |  |
Amortization of Sofora shares |  |  |  |  |  |  |  |
Number of dividend certificates | item |  |  |  |  |  | 1 |  |
Sofora | Argentina Inversiones S.A. | Maximum |  |  |  |  |  |  |  |
Amortization of Sofora shares |  |  |  |  |  |  |  |
Dividend rights |  |  |  |  |  | $ 470,000,000 |  |
Telecom Argentina |  |  |  |  |  |  |  |
Amortization of Sofora shares |  |  |  |  |  |  |  |
Number of directors appointed | director |  |  |  | 2 | 2 |  |  |
Number of alternate directors appointed | director |  |  |  | 2 | 2 |  |  |
Number of members appointed to Supervisory Committee | director |  |  |  | 1 | 1 |  |  |
Number of alternates appointed to the Supervisory Committee | director |  |  |  | 1 | 1 |  |  |
WAI |  |  |  |  |  |  |  |
Amortization of Sofora shares |  |  |  |  |  |  |  |
Percentage of capital stock owned and voting rights |  |  |  |  |  |  | 15.00% |

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